package com.visual.mywebapp.client;

import java.util.ArrayList;
import java.util.Date;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.Random;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.FlexTable;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.event.dom.client.KeyPressEvent;
import com.google.gwt.event.dom.client.KeyPressHandler;
import com.google.gwt.i18n.client.DateTimeFormat;
import com.google.gwt.i18n.client.NumberFormat;

public class MyWebApp implements EntryPoint {

  private static final int REFRESH_INTERVAL = 5000; // ms
  private VerticalPanel mainPanel = new VerticalPanel();
  private FlexTable stocksFlexTable = new FlexTable();
  private HorizontalPanel addPanel = new HorizontalPanel();
  private TextBox newSymbolTextBox = new TextBox();
  private Button addStockButton = new Button("Add");
  private Label lastUpdatedLabel = new Label();
  private ArrayList<String> stocks = new ArrayList<String>();
  private StockPriceServiceAsync stockPriceSvc = GWT.create(StockPriceService.class);
  private Label errorMsgLabel = new Label();

  /**
   * Entry point method.
   */
  public void onModuleLoad() {
    // Create table for stock data.
    stocksFlexTable.setText(0, 0, "Symbol");
    stocksFlexTable.setText(0, 1, "Price");
    stocksFlexTable.setText(0, 2, "Change");
    stocksFlexTable.setText(0, 3, "Remove");

    // Assemble Add Stock panel.
    addPanel.add(newSymbolTextBox);
    addPanel.add(addStockButton);

    // Assemble Main panel.
    mainPanel.add(stocksFlexTable);
    mainPanel.add(addPanel);
    mainPanel.add(lastUpdatedLabel);
    errorMsgLabel.setStyleName("errorMessage");
    errorMsgLabel.setVisible(false);

    mainPanel.add(errorMsgLabel);

    // Associate the Main panel with the HTML host page.
    RootPanel.get("stockList").add(mainPanel);

    // Move cursor focus to the input box.
    newSymbolTextBox.setFocus(true);
    
    // Setup timer to refresh list automatically.
    Timer refreshTimer = new Timer() {
      @Override
      public void run() {
        refreshWatchList();
      }
    };
    refreshTimer.scheduleRepeating(REFRESH_INTERVAL);
    
    // Listen for mouse events on the Add button.
    addStockButton.addClickHandler(new ClickHandler() {
      public void onClick(ClickEvent event) {
        addStock();
      }
    });
    // Listen for keyboard events in the input box.
    newSymbolTextBox.addKeyPressHandler(new KeyPressHandler() {
      public void onKeyPress(KeyPressEvent event) {
        if (event.getCharCode() == KeyCodes.KEY_ENTER) {
          addStock();
        }
      }
    });
  }
  

  /**
   * Add stock to FlexTable. Executed when the user clicks the addStockButton or
   * presses enter in the newSymbolTextBox.
   */
  private void addStock() {
	  final String symbol = newSymbolTextBox.getText().toUpperCase().trim();
	    newSymbolTextBox.setFocus(true);

	    // Stock code must be between 1 and 10 chars that are numbers, letters, or dots.
	    if (!symbol.matches("^[0-9A-Z\\.]{1,10}$")) {
	      Window.alert("'" + symbol + "' is not a valid symbol.");
	      newSymbolTextBox.selectAll();
	      return;
	    }

	    newSymbolTextBox.setText("");

	    // Don't add the stock if it's already in the table.
	    if (stocks.contains(symbol))
	      return;

	    // Add the stock to the table.
	    int row = stocksFlexTable.getRowCount();
	    stocks.add(symbol);
	    stocksFlexTable.setText(row, 0, symbol);

	 // Add a button to remove this stock from the table.
	    Button removeStockButton = new Button("x");
	    removeStockButton.addClickHandler(new ClickHandler() {
	      public void onClick(ClickEvent event) {
	        int removedIndex = stocks.indexOf(symbol);
	        stocks.remove(removedIndex);        stocksFlexTable.removeRow(removedIndex + 1);
	      }
	    });
	    stocksFlexTable.setWidget(row, 3, removeStockButton);

	 // Get the stock price.
	    refreshWatchList();

  }
  /**
   * Generate random stock prices.
   */
  private void refreshWatchList() {
	// Initialize the service proxy.
	    if (stockPriceSvc == null) {
	      stockPriceSvc = GWT.create(StockPriceService.class);
	    }

	    // Set up the callback object.
	    AsyncCallback<StockPrice[]> callback = new AsyncCallback<StockPrice[]>() {
public void onFailure(Throwable caught) {
	// If the stock code is in the list of delisted codes, display an error message.
    String details = caught.getMessage();
    if (caught instanceof DelistedException) {
      details = "Company '" + ((DelistedException)caught).getSymbol() + "' was delisted";
    }

    errorMsgLabel.setText("Error: " + details);
    errorMsgLabel.setVisible(true);
	      }

	      public void onSuccess(StockPrice[] result) {
	        updateTable(result);
	      }
	    };

	    // Make the call to the stock price service.
	    stockPriceSvc.getPrices(stocks.toArray(new String[0]), callback);
  }
  /**
   * Update the Price and Change fields all the rows in the stock table.
   *
   * @param prices Stock data for all rows.
   */
  private void updateTable(StockPrice[] prices) {
    for (int i = 0; i < prices.length; i++) {
      updateTable(prices[i]);
    }
    // Display timestamp showing last refresh.
    lastUpdatedLabel.setText("Last update : "
        + DateTimeFormat.getMediumDateTimeFormat().format(new Date()));

    //Clear any errors
    errorMsgLabel.setVisible(false);
  }


  /**
   * Update a single row in the stock table.
   *
   * @param price Stock data for a single row.
   */
  private void updateTable(StockPrice price) {
    // Make sure the stock is still in the stock table.
    if (!stocks.contains(price.getSymbol())) {
      return;
    }

    int row = stocks.indexOf(price.getSymbol()) + 1;

    // Format the data in the Price and Change fields.
    String priceText = NumberFormat.getFormat("#,##0.00").format(
        price.getPrice());
    NumberFormat changeFormat = NumberFormat.getFormat("+#,##0.00;-#,##0.00");
    String changeText = changeFormat.format(price.getChange());
    String changePercentText = changeFormat.format(price.getChangePercent());

    // Populate the Price and Change fields with new data.
    stocksFlexTable.setText(row, 1, priceText);
    stocksFlexTable.setText(row, 2, changeText + " (" + changePercentText
        + "%)");
  }

}